INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Current Status of the International Herbicide-Resistant Weed Database

Sunday, January 23, 2022

There are currently 509 unique cases (species x site of action) of herbicide resistant weeds globally, with 266 species (153 dicots and 113 monocots). Weeds have evolved resistance to 21 of the 31 known herbicide sites of action and to 164 different herbicides. Herbicide resistant weeds have been reported in 95 crops in 71 countries. The website has 3088 registered users and 648 weed scientists have contributed new cases of herbicide resistant weeds. View Recent Additions, Site of Action Summary, or the Herbicide Classification System.

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, January 23, 2022 .  Available  www.weedscience.org Copyright © 1993- 2022 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.